On Mon, 23 Oct 2000, Petr Vandrovec wrote:
>
> Yes. With sleep(60) no oops occur (it takes ~45 secs to exit child).
> This signals to me: should not vmtruncate_list acquire mm->mmap_sem,
> if it modifies page tables?
No.
It should get the page_table lock, but that is sufficient for anybody who
_clears_ page tables (and is pretty much the same case as paging something
out of somebody elses page tables).
> I cannot find anything what prevents doing
> vmtruncate in one task and filemap_sync in another - neither
> page_table_lock spinlock, nor mmap_sem semaphore...
filemap_sync() does hold the page table lock.
(Which is certainly not to say that it's necessarily bug-free, but I don't
see any obvious problems off-hand).
Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Oct 23 2000 - 21:00:21 EST